<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
        <center>
            请输入城市名称：<input type="text" name="city" id="city">
        </center>
</body>
</html>
<script src="jquery-3.3.1.min.js"></script>
<script>
    $("#city").blur(function(){
       var city = $(this).val();
       $.ajax({
          url:"tq.php",
          data:{city:city},
          dataType:"json",
           type:"post",
           success:function(res)
           {
              alert(res.msa);
           }
       });
    });
</script>




























